128125769 has 2 divisors, whose sum is σ = 128125770. Its totient is φ = 128125768.

The previous prime is 128125763. The next prime is 128125771. The reversal of 128125769 is 967521821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73188025 + 54937744 = 8555^2 + 7412^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128125769 is a prime.

It is a super-2 number, since 2×128125769² = 32832425363682722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 128125771, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (128125763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64062884 + 64062885.

It is an arithmetic number, because the mean of its divisors is an integer number (64062885).

Almost surely, 2^128125769 is an apocalyptic number.

It is an amenable number.

128125769 is a deficient number, since it is larger than the sum of its proper divisors (1).

128125769 is an equidigital number, since it uses as much as digits as its factorization.

128125769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 128125769 is about 11319.2653913582. The cubic root of 128125769 is about 504.1334273952.

It can be divided in two parts, 12812 and 5769, that added together give a palindrome (18581).

The spelling of 128125769 in words is "one hundred twenty-eight million, one hundred twenty-five thousand, seven hundred sixty-nine".